Comment deprecated formulas

Prod-Related: PROD-24516 (PROD:24516)
Closes-bug: PROD-25506 (PROD:25506)

Change-Id: Id064111fe2502537ee66fdacad09e9a2dbe5bc41
diff --git a/salt/master/formula/git/stacklight.yml b/salt/master/formula/git/stacklight.yml
index ed07d82..05e27e9 100644
--- a/salt/master/formula/git/stacklight.yml
+++ b/salt/master/formula/git/stacklight.yml
@@ -25,10 +25,11 @@
                   enabled: true
                 grafana3_dashboard.py:
                   enabled: true
-            graphite:
-              source: git
-              address: '${_param:salt_master_environment_repository}/salt-formula-graphite.git'
-              revision: ${_param:salt_master_environment_revision}
+# Deprecated since 2018.12
+#            graphite:
+#              source: git
+#              address: '${_param:salt_master_environment_repository}/salt-formula-graphite.git'
+#              revision: ${_param:salt_master_environment_revision}
             heka:
               module:
                 heka_alarming.py: